Question 1

Which of the following best explains why animals must obtain essential amino acids from their diet?

Accepted Answer

Animals cannot synthesize all amino acids needed for protein synthesis.

Question 2

A patient presents with fatigue, pale skin, and loss of teeth after a long sea voyage. Which nutrient deficiency is most likely responsible for these symptoms?

Accepted Answer

Vitamin C

Question 3

Which of the following is a correct sequence of the four main stages of food processing in animals?

Accepted Answer

Ingestion, digestion, absorption, elimination

Question 4

Why is the stomach able to digest proteins without digesting itself under normal conditions?

Accepted Answer

The stomach lining is protected by a layer of mucus and rapid cell renewal.

Question 5

Which of the following statements about the absorption of fats in the small intestine is correct?

Accepted Answer

Fatty acids and monoglycerides are reassembled into triglycerides and transported as chylomicrons into lacteals.

Question 6

A vegetarian wants to ensure they get all essential amino acids. Which dietary strategy is most effective?

Accepted Answer

Combine grains and legumes in the diet.

Question 7

Which organ produces bile, and what is its primary function in digestion?

Accepted Answer

Liver; emulsifies fats

Question 8

What is the main function of the colon in the large intestine?

Accepted Answer

Reabsorption of water

Question 9

Which hormone is released in response to the stretching of the stomach wall and stimulates the production of gastric juices?

Accepted Answer

Gastrin

Question 10

A person with a deficiency in linoleic acid would most likely benefit from increasing their intake of which foods?

Accepted Answer

Grains, vegetables, and seeds

Question 11

Which of the following best describes the role of the hepatic portal vein in digestion?

Accepted Answer

It transports nutrient-rich blood from the small intestine to the liver.

Question 12

Which adaptation is most likely found in herbivorous mammals to aid in the digestion of plant material?

Accepted Answer

Presence of a rumen and gut microbes

Question 13

Which of the following is a correct description of peristalsis?

Accepted Answer

The rhythmic contraction and relaxation of smooth muscle to move food along the digestive tract

Question 14

A person is experiencing heartburn due to acid reflux. Which structure is most likely malfunctioning?

Accepted Answer

Lower esophageal sphincter

Question 15

Which of the following best explains why the Inuit traditionally did not suffer from scurvy despite a lack of citrus fruits in their diet?

Accepted Answer

Their diet included raw animal products rich in vitamin C.

Question 16

Which of the following is a multi-step process that describes the digestion and absorption of carbohydrates?

Accepted Answer

Carbohydrates are broken down by salivary and pancreatic amylases into monosaccharides, which are then absorbed in the small intestine.

Question 17

Which feedback mechanism suppresses appetite after a meal?

Accepted Answer

Release of insulin from the pancreas and leptin from adipose tissue

Question 18

Which of the following equations correctly represents the hydrolysis of sucrose by sucrase?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11} + H_2O \xrightarrow{sucrase} C_6H_{12}$$O_6 + C_6H$$_{12}$$O_6$$}$

Question 19

Which of the following best describes the function of pepsin in the stomach?

Accepted Answer

Pepsin breaks down proteins into smaller polypeptides and amino acids.

Question 20

Which of the following is a real-world example of a clinical trial that led to a major nutritional discovery?

Accepted Answer

James Lind's experiment with sailors and citrus fruits to cure scurvy.

Animal Nutrition: Structure, Function, and Evolution of Digestive Systems

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